How do i merge two or more rows based on their foreign key?
I have three tables which are:
A(a1, a2, a3)
//This tbl (Table) can have multiple instances of a1, but cause of its dependence on b1,
//we have a unique record each time
B(b1, a1, b2)
//tbl C has a relationship with tbl B through b1. b1 can also have multiple instances, but
//sometimes a number of unique records in this table can tie to just one record in the B tbl.
C(c1, b1, c2, c3)
Example:
//Table B sample data
b1 a1 b2
1 25 paper
2 29 pencil
3 29 parker
//Table C sample data
c1 b1 c2 c3
1 1 w long
2 2 b long
3 2 g short
4 3 v fat
Explanation: For the record 2 in tbl B, records 2 and开发者_如何学运维 3 in tbl C should form a single record for it.
From every thing so far, tbl A can have multiple records in tbl B which are distinct to tbl A. Tbl B can also have multiple records in tbl C, but those multiple records must be merged into a single record (Where ever there is a duplicate foreign key in tbl C, then a merging should occur).
I hope i have done a good job at explaining my problem. I need a query to do this. Can anyone help please?
Addition #1: In an effort to make it clearer i'll use the really situation im faced with.
Every drug is grouped under a main classification, sub classification, and a generic name.
-Main Classification
-Sub Classification
-Generic Name
Each generic name can have more than one strength: Example:
-TRIMETHOPRIM
Strengths: 100mg, 200mg
There are also times where you can have a generic name that is a combination of two drugs and these two drugs have their strengths, which counts as on strength for this generic name. You can also have multiple. Example:
-SULFAMETHOXAZOLE & TRIMETHOPRIM
Strengths: 40mg & 8mg/mL, 400mg & 80mg, 800mg & 160mg
So, to enable me keep track of the individual strengths of the combined generic name, i needed another table.
GenericTbl(Id, Name, ...)
GenericDetails(Id, GenericId, ...)
Strenghts(Id, GenericDetailsId, Strength, Unit, DosageForm, ...)
I hope this helps.
Addition #2 I have changed the ids to integers instead of guid (uniqueidentifier)
Pharmacy_GenericDrug
GenericDrugID GenericDrugName DrugSubClassificationID ControlStatusID
1 TRIMETHOPRIM 12 2
2 SULFAME & TRIMETHOPRIM 4 1
Pharmacy_GenericDrugDetails
GenericDrugDetailsID GenericDrugID
1 1
2 2
Pharmacy_Strengths
StrengthID GenericDrugDetailsID DosageStrength Unit
1 1 200 mg
2 2 80 mg
3 2 8 mg/L
For the first#1 GenericDrugID = 1: TRIMETHOPRIM | 12 | 200 | mg | 1
For the second#2 GenericDrugID = 2: SULFAME & TRIMETHOPRIM | 4 | 80 | mg | 8 | mg/L | 1
1 > GenericDrugName | DrugSubClassificationID | DosageSrength | Unit | ControlStatusID
2 > GenericDrugName | DrugSubClassificationID | DosageSrength | Unit | DosageSrength | Unit | ControlStatusID
This is the query that merges two rows based on a foreign key (breaks the rule of 1NF).
DECLARE @StrengthID INT
DECLARE @GenericDrugDetailsID INT
DEClARE @DosageStrength INT
DECLARE @PresentationUnitID INT
DECLARE @DosageFormID INT
DECLARE @RouteOfAdministrationID INT
DECLARE @nCombinations INT
DECLARE @maxCombinations INT
DECLARE @CurrCombinationTotal INT
DECLARE @CurrGenericDrugDetailsID INT
DECLARE @PName VARCHAR(100)
DECLARE @DName VARCHAR(100)
DECLARE @DNameAbbrev VARCHAR(50)
DECLARE @RName VARCHAR(100)
DECLARE @GetGenericDrugStrengths CURSOR
SET @nCombinations = 0
SET @CurrGenericDrugDetailsID = 0
--Get the maximum number of combinations
--=====================================================================================
SET @maxCombinations = (SELECT TOP 1 COUNT(GenericDrugDetailsID) AS maxCombinations
FROM Pharmacy_Strengths
GROUP BY GenericDrugDetailsID
ORDER BY maxCombinations desc)
--=====================================================================================
--Create a temporary temp to hold the strengths
--=====================================================================================
DECLARE @tmpSQL VARCHAR(max)
SET @tmpSQL = ''
IF EXISTS (SELECT * FROM tempdb.sys.tables WHERE NAME LIKE '%tmpStrengths%')
DROP TABLE #tmpStrengths
CREATE TABLE #tmpStrengths (
StrengthID INT NOT NULL,
GenericDrugDetailsID INT NOT NULL,
NumberOfCombinations INT NOT NULL,
DosageStrength1 INT NOT NULL,
PresentationUnitID1 INT NOT NULL,
PresentationUnitName1 VARCHAR(100) NOT NULL,
DosageFormID1 INT NOT NULL,
DosageFormName1 VARCHAR(100) NOT NULL,
DosageFormNameAbbrev1 VARCHAR(50) NULL,
RouteOfAdministrationID1 INT NOT NULL,
RouteOfAdministrationName1 VARCHAR(100) NOT NULL);
IF (@maxCombinations > 1)
BEGIN
DECLARE @counter int
SET @counter = 1
WHILE @counter < @maxCombinations
BEGIN
SET @counter = @counter + 1
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD StrengthID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL;'
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageStrength' + CAST(@counter AS VARCHAR(50)) + ' INT NULL;'
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD PresentationUnitID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL; '
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD PresentationUnitName' + CAST(@counter AS VARCHAR(100)) + ' VARCHAR(100) NULL; '
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageFormID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL; '
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageFormName' + CAST(@counter AS VARCHAR(100)) + ' VARCHAR(100) NULL; '
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD DosageFormNameAbbrev' + CAST(@counter AS VARCHAR(50)) + ' VARCHAR(50) NULL; '
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD RouteOfAdministrationID' + CAST(@counter AS VARCHAR(50)) + ' INT NULL; '
SET @tmpSQL = @tmpSQL + 'ALTER TABLE #tmpStrengths ADD RouteOfAdministrationName' + CAST(@counter AS VARCHAR(100)) + ' VARCHAR(100) NULL; '
END
END
EXEC(@tmpSQL)
--====================================================================================
SET @tmpSQL = ''
SET @GetGenericDrugStrengths = CURSOR FOR
SELECT StrengthID, GenericDrugDetailsID, DosageStrength, PresentationUnitID, DosageFormID, RouteOfAdministrationID
FROM Pharmacy_Strengths
ORDER BY GenericDrugDetailsID ASC
OPEN @GetGenericDrugStrengths
FETCH NEXT FROM @GetGenericDrugStrengths INTO @StrengthID, @GenericDrugDetailsID, @DosageStrength, @PresentationUnitID, @DosageFormID, @RouteOfAdministrationID
WHILE @@FETCH_STATUS = 0
BEGIN
--Get the values of Presentation Unit, Dosage Form, and Route of Administration.
SELECT @PName = PresentationUnitName
FROM Pharmacy_PresentationUnit
WHERE PresentationUnitID = @PresentationUnitID
SELECT @DName = DosageFormName, @DNameAbbrev = DosageFormNameAbbrev
FROM Pharmacy_DosageForm
WHERE DosageFormID = @DosageFormID
SELECT @RName = RouteOfAdministrationName
FROM Pharmacy_RouteOfAdministration
WHERE RouteOfAdministrationID = @RouteOfAdministrationID
IF (@GenericDrugDetailsID = @CurrGenericDrugDetailsID)
BEGIN
SET @nCombinations = (@nCombinations + 1)
--Alter the temporary table now
SET @tmpSQL = @tmpSQL + 'UPDATE #tmpStrengths
SET StrengthID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@StrengthID AS VARCHAR(50)) + ',
DosageStrength' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@DosageStrength AS VARCHAR(50)) + ',
PresentationUnitID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@PresentationUnitID AS VARCHAR(50)) + ',
PresentationUnitName' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@PName AS VARCHAR(100)) + ''',
DosageFormID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@DosageFormID AS VARCHAR(50)) + ',
DosageFormName' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@DName AS VARCHAR(100)) + ''',
DosageFormNameAbbrev' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@DNameAbbrev AS VARCHAR(50)) + ''',
RouteOfAdministrationID' + CAST(@nCombinations AS VARCHAR(50)) + ' = ' + CAST(@RouteOfAdministrationID AS VARCHAR(50)) + ',
RouteOfAdministrationName' + CAST(@nCombinations AS VARCHAR(50)) + ' = ''' + CAST(@RName AS VARCHAR(100)) + '''
WHERE GenericDrugDetailsID = ' + CAST(@GenericDrugDetailsID AS VARCHAR(50));
EXEC(@tmpSQL);
END
ELSE
BEGIN
SET @nCombinations = 1
SET @CurrGenericDrugDetailsID = @GenericDrugDetailsID;
--Get the total number of combinations in advance
SET @CurrCombinationTotal = (SELECT COUNT(GenericDrugDetailsID)
FROM Pharmacy_Strengths
WHERE GenericDrugDetailsID = @GenericDrugDetailsID
GROUP BY GenericDrugDetailsID);
--Insert in the temporary table now
INSERT INTO #tmpStrengths (StrengthID, GenericDrugDetailsID, NumberOfCombinations,
DosageStrength1, PresentationUnitID1, PresentationUnitName1, DosageFormID1,
DosageFormName1, DosageFormNameAbbrev1, RouteOfAdministrationID1, RouteOfAdministrationName1)
VALUES (@StrengthID, @GenericDrugDetailsID, @CurrCombinationTotal, @DosageStrength,
@PresentationUnitID, @PName, @DosageFormID, @DName, @DNameAbbrev, @RouteOfAdministrationID, @RName)
END
--PRINT CAST(@StrengthID AS varchar(50)) + ' ' + CAST(@GenericDrugDetailsID AS varchar(50)) + ' ' + CAST(@DosageStrength AS varchar(50)) + ' ' + CAST(@PresentationUnitID AS varchar(50)) + ' ' + CAST(@DosageFormID as varchar(50)) + ' ' + CAST(@RouteOfAdministrationID as varchar(50))
FETCH NEXT FROM @GetGenericDrugStrengths INTO @StrengthID, @GenericDrugDetailsID, @DosageStrength, @PresentationUnitID, @DosageFormID, @RouteOfAdministrationID
END
--SELECT * from #tmpStrengths
CLOSE @GetGenericDrugStrengths
DEALLOCATE @GetGenericDrugStrengths
SELECT a.GenericDrugID,
a.GenericDrugName,
f.*,
a.InsertDate,
a.InsertFKUserAccountId,
a.UpdateDate,
a.UpdateFKUserAccountId,
a.Version
FROM Pharmacy_GenericDrug a
INNER JOIN Pharmacy_ControlStatus d ON d.ControlStatusID = a.ControlStatusID
INNER JOIN Pharmacy_GenericDrugDetails e ON e.GenericDrugID = a.GenericDrugID
INNER JOIN #tmpStrengths f ON f.GenericDrugDetailsID = e.GenericDrugDetailsID
ORDER BY GenericDrugName ASC
This is what i get before the query:
GenericDrugID GenericDrugName DrugSubClassificationID DrugSubClassificationName DrugClassificationID DrugClassificationName GenericDrugDetailsID DosageStrength PresentationUnitID PresentationUnitName DosageFormID DosageFormName DosageFormNameAbbrev RouteOfAdministrationID RouteOfAdministrationName ControlStatusID ControlStatusName InsertDate InsertFKUserAccountId UpdateDate UpdateFKUserAccountId Version
------------------------------------ ---------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -------------------- -------------- ------------------ ---------------------------------------------------------------------------------------------------- ------------ ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ----------------------- ---------------------------------------------------------------------------------------------------- --------------- ---------------------------------------------------------------------------------------------------- ----------------------- --------------------- ----------------------- --------------------- -----------------------
83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 2 300 1 ml 2 Pill Pill 1 Mouth 3 Narcotic 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077
83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 2 400 1 ml 2 Pill Pill 1 Mouth 3 Narcotic 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077
83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 4 500 1 ml 2 Pill Pill 2 Injection 3 Narcotic 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077
A1D86FD2-2E65-4F2A-B7A2-7B083B71AB9B Generic Drug Two 9925D762-34B8-43B4-A96B-78374F0081B0 Drug Subclassification One C10E9F1B-3985-4DB8-8EF8-A6C82B004B9F Drug Classification Two 1 200 1 ml 2 Pill Pill 1 Mouth 2 None 2009-10-25 10:47:10.623 1 2009-11-15 04:02:47.890 1 2009-10-25 10:47:10.623
This is what i get now:
GenericDrugID GenericDrugName DrugSubClassificationID DrugSubClassificationName DrugClassificationID DrugClassificationName StrengthID GenericDrugDetailsID NumberOfCombinations DosageStrength1 PresentationUnitID1 PresentationUnitName1 DosageFormID1 DosageFormName1 DosageFormNameAbbrev1 RouteOfAdministrationID1 RouteOfAdministrationName1 StrengthID2 DosageStrength2 PresentationUnitID2 PresentationUnitName2 DosageFormID2 DosageFormName2 DosageFormNameAbbrev2 RouteOfAdministrationID2 RouteOfAdministrationName2 InsertDate InsertFKUserAccountId UpdateDate UpdateFKUserAccountId Version
------------------------------------ ---------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ----------- -------------------- -------------------- --------------- ------------------- ---------------------------------------------------------------------------------------------------- ------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ------------------------ ---------------------------------------------------------------------------------------------------- ----------- --------------- ------------------- ---------------------------------------------------------------------------------------------------- ------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ------------------------ ---------------------------------------------------------------------------------------------------- ----------------------- --------------------- ----------------------- --------------------- -----------------------
83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 2 2 2 300 1 ml 2 Pill Pill 1 Mouth 3 400 1 ml 2 Pill Pill 1 Mouth 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077
83222B76-6690-42F2-BDAD-BE5BD2D19D3B Generic Drug One 8ED135ED-5FDB-419A-9C7D-E788A40EAEAC Drug Subclassification Two 61D618F3-A38A-4416-B0A4-FB29AD614B4B Drug Classification One 4 4 1 500 1 ml 2 Pill Pill 2 Injection NULL NULL NULL NULL NULL NULL NULL NULL NULL 2009-10-25 10:10:06.077 1 2009-11-15 07:06:03.733 1 2009-10-25 10:10:06.077
A1D86FD2-2E65-4F2A-B7A2-7B083B71AB9B Generic Drug Two 9925D762-34B8-43B4-A96B-78374F0081B0 Drug Subclassification One C10E9F1B-3985-4DB8-8EF8-A6C82B004B9F Drug Classification Two 1 1 1 200 1 ml 2 Pill Pill 1 Mouth NULL NULL NULL NULL NULL NULL NULL NULL NULL 2009-10-25 10:47:10.623 1 2009-11-15 04:02:47.890 1 2009-10-25 10:47:10.623
For those interested these are the table structures:
CREATE TABLE [dbo].[Pharmacy_GenericDrug](
[GenericDrugID] [uniqueidentifier] NOT NULL CONSTRAINT [DF__Pharmacy___Gener__4E53A1AA] DEFAULT (newid()),
[GenericDrugName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[DrugSubClassificationID] [uniqueidentifier] NOT NULL,
[ControlStatusID] [int] NOT NULL,
[InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrug_InsertDate] DEFAULT (getdate()),
[InsertFKUserAccountId] [int] NOT NULL,
[UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrug_UpdateDate] DEFAULT (getdate()),
[UpdateFKUserAccountId] [int] NOT NULL,
[Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrug_Version] DEFAULT (getdate())
)
CREATE TABLE [dbo].[Pharmacy_GenericDrugDetails](
[GenericDrugDetailsID] [int] IDENTITY(1,1) NOT NULL,
[GenericDrugID] [uniqueidentifier] NOT NULL,
[InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrugDetails_InsertDate] DEFAULT (getdate()),
[InsertFKUserAccountId] [int] NOT NULL,
[UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrugDetails_UpdateDate] DEFAULT (getdate()),
[UpdateFKUserAccountId] [int] NOT NULL,
[Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_GenericDrugDetails_Version] DEFAULT (getdate())
)
CREATE TABLE [dbo].[Pharmacy_Strengths](
[StrengthID] [int] IDENTITY(1,1) NOT NULL,
[GenericDrugDetailsID] [int] NOT NULL,
[DosageStrength] [int] NOT NULL,
[PresentationUnitID] [int] NOT NULL,
[DosageFormID] [int] NOT NULL,
[RouteOfAdministrationID] [int] NOT NULL,
[InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_StrengthCombination_InsertDate] DEFAULT (getdate()),
[InsertFKUserAccountId] [int] NOT NULL,
[UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_StrengthCombination_UpdateDate] DEFAULT (getdate()),
[UpdateFKUserAccountId] [int] NOT NULL,
[Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_StrengthCombination_Version] DEFAULT (getdate())
)
CREATE TABLE [dbo].[Pharmacy_PresentationUnit](
[PresentationUnitID] [int] IDENTITY(1,1) NOT NULL,
[PresentationUnitName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_PresentationUnit_InsertDate] DEFAULT (getdate()),
[InsertFKUserAccountId] [int] NOT NULL,
[UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_PresentationUnit_UpdateDate] DEFAULT (getdate()),
[UpdateFKUserAccountId] [int] NOT NULL,
[Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_PresentationUnit_Version] DEFAULT (getdate())
)
CREATE TABLE [dbo].[Pharmacy_DosageForm](
[DosageFormID] [int] IDENTITY(1,1) NOT NULL,
[DosageFormName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[DosageFormNameAbbrev] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_DosageForm_InsertDate] DEFAULT (getdate()),
[InsertFKUserAccountId] [int] NOT NULL,
[UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_DosageForm_UpdateDate] DEFAULT (getdate()),
[UpdateFKUserAccountId] [int] NOT NULL,
[Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_DosageForm_Version] DEFAULT (getdate())
)
CREATE TABLE [dbo].[Pharmacy_RouteOfAdministration](
[RouteOfAdministrationID] [int] IDENTITY(1,1) NOT NULL,
[RouteOfAdministrationName] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[InsertDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_RouteOfAdministration_InsertDate] DEFAULT (getdate()),
[InsertFKUserAccountId] [int] NOT NULL,
[UpdateDate] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_RouteOfAdministration_UpdateDate] DEFAULT (getdate()),
[UpdateFKUserAccountId] [int] NOT NULL,
[Version] [datetime] NOT NULL CONSTRAINT [DF_Pharmacy_RouteOfAdministration_Version] DEFAULT (getdate())
)
OK, let's take a stab and see if this gets us anywhere.
Table A: GenericTbl(Id, Name, ...)
Table B: GenericDetails(Id, GenericId, ...)
Table C: Strengths(Id, GenericDetailsId, Strength, Unit, DosageForm, ...)
If when you say merge you're looking for an output set which puts the results together for the strengths of a single generic you could do something along the lines of
SELECT
g.Id,
g.Name,
gd.Id,
s.Strength,
s.Unit,
s.OtherFields /*fill in the blanks*/
FROM
GenericTbl g
INNER JOIN GenericDetails gd
on g.Id=gd.GenericId
INNER JOIN Strengths s
ON gd.Id=s.GenericDetailsId
ORDER BY
g.Id, gd.Id, s.Id
and that'd give you a single results set listing all the different strengths for each of the generics, grouped their types, with each result on one row.
If what you want is a single row per type with columns to tell you the options available, it should be doable with cursors and temporary tables, or pivots I think from memory.
If what you're actually looking for is for the records to be merged on insert into the database so you only have a single underlying record which contains all the data then you could do it through triggers, but I can't quite see why you'd want to because you'd end up with a 1:1 mapping for B and C and might as well just have them as a single table.
Here is another solution using SQLXML:
SELECT
STUFF
(
(
SELECT ', ' + cast(id AS NVARCHAR(max)) + ': ' + video
FROM Video
ORDER BY Id
FOR XML PATH ('')
),1,1,''
)
CREATE TABLE [dbo].[Video](
[ID] [int] NOT NULL,
[Video] [varchar](50) NOT NULL,
[Views] [int] NOT NULL
)
Result: 1: Hulk, 2: Jack, 3: The King
Update: I also just found this at Data Management and Exchange.
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